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【单选题】
( )是腔肠动物所特有的。A.
刺细胞
B.
间细胞
C.
原细胞
D.
领细胞
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反馈参考答案：
举一反三
【单选题】A sweep oar is an oar that is（）.
A.
generally shorter than the others and is used to steer with
B.
is longer than the others and is used as the stroke oar
C.
is raised in the bow of the boat for the steersman to steer by
D.
longer than the others used for steering
【简答题】混凝土的水灰比越大,水泥用量越多,则徐变越 收缩越 。
【单选题】The steering oar in a lifeboat is（）.
A.
shorter than the others
B.
used for the stroke oar
C.
used by the forward man in the boat to direct the bow
D.
longer than the others and should be lashed to the stern
【单选题】The steering oar in a lifeboat is usually referred to as the _______.
A.
bumpkin oar
B.
stroke oar
C.
sweep oar
D.
becket oar
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